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Searching for a dusty cometary belt around TRAPPIST-1 with ALMA
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Henning, Th., Triaud, A. H. M. J., Matrà, L., Kama, M., Kennedy, Grant M., Wyatt, M. C. and Marino, S. (2020) Searching for a dusty cometary belt around TRAPPIST-1 with ALMA. Monthly Notices of the Royal Astronomical Society, 492 (4). pp. 6067-6073. doi:10.1093/mnras/staa266 ISSN 1745-3933.
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Official URL: http://dx.doi.org/10.1093/mnras/staa266
Abstract
Low-mass stars might offer today the best opportunities to detect and characterize planetary systems, especially those harbouring close-in low-mass temperate planets. Among those stars, TRAPPIST-1 is exceptional since it has seven Earth-sized planets, of which three could sustain liquid water on their surfaces. Here we present new and deep ALMA observations of TRAPPIST-1 to look for an exo-Kuiper belt which can provide clues about the formation and architecture of this system. Our observations at 0.88 mm did not detect dust emission, but can place an upper limit of 23 µJy if the belt is smaller than 4 au, and 0.15 mJy if resolved and 100 au in radius. These limits correspond to low dust masses of ̃10-5 to 10-2 M⊕, which are expected after 8 Gyr of collisional evolution unless the system was born with a >20 M⊕ belt of 100 km-sized planetesimals beyond 40 au or suffered a dynamical instability. This 20 M⊕ mass upper limit is comparable to the combined mass in TRAPPIST-1 planets, thus it is possible that most of the available solid mass in this system was used to form the known planets. A similar analysis of the ALMA data on Proxima Cen leads us to conclude that a belt born with a mass ≳1 M⊕ in 100 km-sized planetesimals could explain its putative outer belt at 30 au. We recommend that future characterizations of debris discs around low-mass stars should focus on nearby and young systems if possible.
Item Type: | Journal Article | |||||||||||||||
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Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||
Library of Congress Subject Headings (LCSH): | Circumstellar matter, Planetary systems , Interferometry, Low mass stars | |||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||||||||
Publisher: | Oxford University Press | |||||||||||||||
ISSN: | 1745-3933 | |||||||||||||||
Official Date: | 29 January 2020 | |||||||||||||||
Dates: |
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Volume: | 492 | |||||||||||||||
Number: | 4 | |||||||||||||||
Page Range: | pp. 6067-6073 | |||||||||||||||
DOI: | 10.1093/mnras/staa266 | |||||||||||||||
Status: | Peer Reviewed | |||||||||||||||
Publication Status: | Published | |||||||||||||||
Reuse Statement (publisher, data, author rights): | This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record S Marino, M C Wyatt, G M Kennedy, M Kama, L Matrà, A H M J Triaud, Th Henning, Searching for a dusty cometary belt around TRAPPIST-1 with ALMA, Monthly Notices of the Royal Astronomical Society, Volume 492, Issue 4, March 2020, Pages 6067–6073, https://doi.org/10.1093/mnras/staa266 is available online at: https://doi.org/10.1093/mnras/staa266 | |||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||
Date of first compliant deposit: | 26 February 2020 | |||||||||||||||
Date of first compliant Open Access: | 27 February 2020 | |||||||||||||||
RIOXX Funder/Project Grant: |
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